first of all I will make a 4 wheel small toy car (driven by small 4 dc motors) on the top of that I will place a camera for image extraction , this image is processed by raspberry pi and this will control motors of the car.

For this I need Raspberry pi 3, a raspberry pi 5 camera , 4 dc motor and components needed for toy car and a dc motor driver . But there is one problem that all these things need some money . So, without money how I start this?